Buddy, My Pal
Buddy is/are/was my best friend since/for. We've experienced a lot/plenty/huge amount of things together. He/She/It was always there for me, no matter what. We used to play in the park all the time. I recall one time/a specific day when we played hide and seek for hours. Buddy was always the best listener. He/She/It taught me/showed me the import